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-rw-r--r--generic/tkCanvText.c298
-rw-r--r--generic/tkFont.c388
-rw-r--r--generic/tkInt.h28
3 files changed, 612 insertions, 102 deletions
diff --git a/generic/tkCanvText.c b/generic/tkCanvText.c
index efa2b70..474ed25 100644
--- a/generic/tkCanvText.c
+++ b/generic/tkCanvText.c
@@ -9,7 +9,7 @@
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tkCanvText.c,v 1.32 2008/11/09 20:51:28 nijtmans Exp $
+ * RCS: @(#) $Id: tkCanvText.c,v 1.33 2008/11/22 18:08:51 dkf Exp $
*/
#include <stdio.h>
@@ -57,6 +57,8 @@ typedef struct TextItem {
* means no word-wrap. */
int underline; /* Index of character to put underline beneath
* or -1 for no underlining. */
+ double angle; /* What angle, in degrees, to draw the text
+ * at. */
/*
* Fields whose values are derived from the current values of the
@@ -66,18 +68,18 @@ typedef struct TextItem {
int numChars; /* Length of text in characters. */
int numBytes; /* Length of text in bytes. */
Tk_TextLayout textLayout; /* Cached text layout information. */
- int leftEdge; /* Pixel location of the left edge of the text
- * item; where the left border of the text
- * layout is drawn. */
- int rightEdge; /* Pixel just to right of right edge of area
- * of text item. Used for selecting up to end
- * of line. */
+ int actualWidth; /* Width of text as computed. Used to make
+ * selections of wrapped text display
+ * right. */
+ double drawOrigin[2]; /* Where we start drawing from. */
GC gc; /* Graphics context for drawing text. */
GC selTextGC; /* Graphics context for selected text. */
GC cursorOffGC; /* If not None, this gives a graphics context
* to use to draw the insertion cursor when
* it's off. Used if the selection and
* insertion cursor colors are the same. */
+ double sine; /* Sine of angle field. */
+ double cosine; /* Cosine of angle field. */
} TextItem;
/*
@@ -101,6 +103,8 @@ static Tk_ConfigSpec configSpecs[] = {
NULL, Tk_Offset(TextItem, activeStipple), TK_CONFIG_NULL_OK},
{TK_CONFIG_ANCHOR, "-anchor", NULL, NULL,
"center", Tk_Offset(TextItem, anchor), TK_CONFIG_DONT_SET_DEFAULT},
+ {TK_CONFIG_DOUBLE, "-angle", NULL, NULL,
+ "0.0", Tk_Offset(TextItem, angle), TK_CONFIG_DONT_SET_DEFAULT},
{TK_CONFIG_COLOR, "-disabledfill", NULL, NULL,
NULL, Tk_Offset(TextItem, disabledColor), TK_CONFIG_NULL_OK},
{TK_CONFIG_BITMAP, "-disabledstipple", NULL, NULL,
@@ -199,6 +203,8 @@ Tk_ItemType tkTextType = {
TextDeleteChars, /* dTextProc */
NULL, /* nextPtr */
};
+
+#define ROUND(d) ((int) floor((d) + 0.5))
/*
*--------------------------------------------------------------
@@ -258,15 +264,18 @@ CreateText(
textPtr->text = NULL;
textPtr->width = 0;
textPtr->underline = -1;
+ textPtr->angle = 0.0;
textPtr->numChars = 0;
textPtr->numBytes = 0;
textPtr->textLayout = NULL;
- textPtr->leftEdge = 0;
- textPtr->rightEdge = 0;
+ textPtr->actualWidth = 0;
+ textPtr->drawOrigin[0] = textPtr->drawOrigin[1] = 0.0;
textPtr->gc = None;
textPtr->selTextGC = None;
textPtr->cursorOffGC = None;
+ textPtr->sine = 0.0;
+ textPtr->cosine = 1.0;
/*
* Process the arguments to fill in the item record. Only 1 (list) or 2 (x
@@ -325,14 +334,14 @@ TextCoords(
if (objc == 0) {
Tcl_Obj *obj = Tcl_NewObj();
-
Tcl_Obj *subobj = Tcl_NewDoubleObj(textPtr->x);
+
Tcl_ListObjAppendElement(interp, obj, subobj);
subobj = Tcl_NewDoubleObj(textPtr->y);
Tcl_ListObjAppendElement(interp, obj, subobj);
Tcl_SetObjResult(interp, obj);
} else if (objc < 3) {
- if (objc==1) {
+ if (objc == 1) {
if (Tcl_ListObjGetElements(interp, objv[0], &objc,
(Tcl_Obj ***) &objv) != TCL_OK) {
return TCL_ERROR;
@@ -415,24 +424,24 @@ ConfigureText(
itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
}
- if(state == TK_STATE_NULL) {
+ if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
color = textPtr->color;
stipple = textPtr->stipple;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
- if (textPtr->activeColor!=NULL) {
+ if (textPtr->activeColor != NULL) {
color = textPtr->activeColor;
}
- if (textPtr->activeStipple!=None) {
+ if (textPtr->activeStipple != None) {
stipple = textPtr->activeStipple;
}
- } else if (state==TK_STATE_DISABLED) {
- if (textPtr->disabledColor!=NULL) {
+ } else if (state == TK_STATE_DISABLED) {
+ if (textPtr->disabledColor != NULL) {
color = textPtr->disabledColor;
}
- if (textPtr->disabledStipple!=None) {
+ if (textPtr->disabledStipple != None) {
stipple = textPtr->disabledStipple;
}
}
@@ -513,6 +522,22 @@ ConfigureText(
textPtr->insertPos = textPtr->numChars;
}
+ /*
+ * Restrict so that 0.0 <= angle < 360.0, and then recompute the cached
+ * sine and cosine of the angle. Note that fmod() can produce negative
+ * results, and we try to avoid negative zero as well.
+ */
+
+ textPtr->angle = fmod(textPtr->angle, 360.0);
+ if (textPtr->angle < 0.0) {
+ textPtr->angle += 360.0;
+ }
+ if (textPtr->angle == 0.0) {
+ textPtr->angle = 0.0;
+ }
+ textPtr->sine = sin(textPtr->angle * PI/180.0);
+ textPtr->cosine = cos(textPtr->angle * PI/180.0);
+
ComputeTextBbox(canvas, textPtr);
return TCL_OK;
}
@@ -603,10 +628,11 @@ ComputeTextBbox(
TextItem *textPtr) /* Item whose bbox is to be recomputed. */
{
Tk_CanvasTextInfo *textInfoPtr;
- int leftX, topY, width, height, fudge;
+ int leftX, topY, width, height, fudge, i;
Tk_State state = textPtr->header.state;
+ double x[4], y[4], dx[4], dy[4], sinA, cosA, tmp;
- if(state == TK_STATE_NULL) {
+ if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
@@ -624,8 +650,11 @@ ComputeTextBbox(
* bounding box for the text item.
*/
- leftX = (int) floor(textPtr->x + 0.5);
- topY = (int) floor(textPtr->y + 0.5);
+ leftX = ROUND(textPtr->x);
+ topY = ROUND(textPtr->y);
+ for (i=0 ; i<4 ; i++) {
+ dx[i] = dy[i] = 0.0;
+ }
switch (textPtr->anchor) {
case TK_ANCHOR_NW:
case TK_ANCHOR_N:
@@ -636,12 +665,18 @@ ComputeTextBbox(
case TK_ANCHOR_CENTER:
case TK_ANCHOR_E:
topY -= height / 2;
+ for (i=0 ; i<4 ; i++) {
+ dy[i] = -height / 2;
+ }
break;
case TK_ANCHOR_SW:
case TK_ANCHOR_S:
case TK_ANCHOR_SE:
topY -= height;
+ for (i=0 ; i<4 ; i++) {
+ dy[i] = -height;
+ }
break;
}
switch (textPtr->anchor) {
@@ -654,17 +689,27 @@ ComputeTextBbox(
case TK_ANCHOR_CENTER:
case TK_ANCHOR_S:
leftX -= width / 2;
+ for (i=0 ; i<4 ; i++) {
+ dx[i] = -width / 2;
+ }
break;
case TK_ANCHOR_NE:
case TK_ANCHOR_E:
case TK_ANCHOR_SE:
leftX -= width;
+ for (i=0 ; i<4 ; i++) {
+ dx[i] = -width;
+ }
break;
}
- textPtr->leftEdge = leftX;
- textPtr->rightEdge = leftX + width;
+ textPtr->actualWidth = width;
+
+ sinA = textPtr->sine;
+ cosA = textPtr->cosine;
+ textPtr->drawOrigin[0] = textPtr->x + dx[0]*cosA + dy[0]*sinA;
+ textPtr->drawOrigin[1] = textPtr->y + dy[0]*cosA - dx[0]*sinA;
/*
* Last of all, update the bounding box for the item. The item's bounding
@@ -677,10 +722,50 @@ ComputeTextBbox(
if (textInfoPtr->selBorderWidth > fudge) {
fudge = textInfoPtr->selBorderWidth;
}
- textPtr->header.x1 = leftX - fudge;
- textPtr->header.y1 = topY;
- textPtr->header.x2 = leftX + width + fudge;
- textPtr->header.y2 = topY + height;
+
+ /*
+ * Apply the rotation before computing the bounding box.
+ */
+
+ dx[0] -= fudge;
+ dx[1] += width + fudge;
+ dx[2] += width + fudge;
+ dy[2] += height;
+ dx[3] -= fudge;
+ dy[3] += height;
+ for (i=0 ; i<4 ; i++) {
+ x[i] = textPtr->x + dx[i] * cosA + dy[i] * sinA;
+ y[i] = textPtr->y + dy[i] * cosA - dx[i] * sinA;
+ }
+
+ /*
+ * Convert to a rectilinear bounding box.
+ */
+
+ for (i=1,tmp=x[0] ; i<4 ; i++) {
+ if (x[i] < tmp) {
+ tmp = x[i];
+ }
+ }
+ textPtr->header.x1 = ROUND(tmp);
+ for (i=1,tmp=y[0] ; i<4 ; i++) {
+ if (y[i] < tmp) {
+ tmp = y[i];
+ }
+ }
+ textPtr->header.y1 = ROUND(tmp);
+ for (i=1,tmp=x[0] ; i<4 ; i++) {
+ if (x[i] > tmp) {
+ tmp = x[i];
+ }
+ }
+ textPtr->header.x2 = ROUND(tmp);
+ for (i=1,tmp=y[0] ; i<4 ; i++) {
+ if (y[i] > tmp) {
+ tmp = y[i];
+ }
+ }
+ textPtr->header.y2 = ROUND(tmp);
}
/*
@@ -720,16 +805,16 @@ DisplayCanvText(
textPtr = (TextItem *) itemPtr;
textInfoPtr = textPtr->textInfoPtr;
- if(state == TK_STATE_NULL) {
+ if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
stipple = textPtr->stipple;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
- if (textPtr->activeStipple!=None) {
+ if (textPtr->activeStipple != None) {
stipple = textPtr->activeStipple;
}
- } else if (state==TK_STATE_DISABLED) {
- if (textPtr->disabledStipple!=None) {
+ } else if (state == TK_STATE_DISABLED) {
+ if (textPtr->disabledStipple != None) {
stipple = textPtr->disabledStipple;
}
}
@@ -750,6 +835,8 @@ DisplayCanvText(
selFirstChar = -1;
selLastChar = 0; /* lint. */
+ Tk_CanvasDrawableCoords(canvas, textPtr->drawOrigin[0],
+ textPtr->drawOrigin[1], &drawableX, &drawableY);
if (textInfoPtr->selItemPtr == itemPtr) {
selFirstChar = textInfoPtr->selectFirst;
@@ -780,20 +867,30 @@ DisplayCanvText(
x = xFirst;
height = hFirst;
for (y = yFirst ; y <= yLast; y += height) {
+ int dx1, dy1, dx2, dy2;
+ double s = textPtr->sine, c = textPtr->cosine;
+ XPoint points[4];
+
if (y == yLast) {
width = xLast + wLast - x;
} else {
- width = textPtr->rightEdge - textPtr->leftEdge - x;
+ width = textPtr->actualWidth - x;
}
- Tk_CanvasDrawableCoords(canvas,
- (double) (textPtr->leftEdge + x
- - textInfoPtr->selBorderWidth),
- (double) (textPtr->header.y1 + y),
- &drawableX, &drawableY);
- Tk_Fill3DRectangle(Tk_CanvasTkwin(canvas), drawable,
- textInfoPtr->selBorder, drawableX, drawableY,
- width + 2 * textInfoPtr->selBorderWidth,
- height, textInfoPtr->selBorderWidth, TK_RELIEF_RAISED);
+ dx1 = x - textInfoPtr->selBorderWidth;
+ dy1 = y;
+ dx2 = width + 2 * textInfoPtr->selBorderWidth;
+ dy2 = height;
+ points[0].x = drawableX + dx1*c + dy1*s;
+ points[0].y = drawableY + dy1*c - dx1*s;
+ points[1].x = drawableX + (dx1+dx2)*c + dy1*s;
+ points[1].y = drawableY + dy1*c - (dx1+dx2)*s;
+ points[2].x = drawableX + (dx1+dx2)*c + (dy1+dy2)*s;
+ points[2].y = drawableY + (dy1+dy2)*c - (dx1+dx2)*s;
+ points[3].x = drawableX + dx1*c + (dy1+dy2)*s;
+ points[3].y = drawableY + (dy1+dy2)*c - dx1*s;
+ Tk_Fill3DPolygon(Tk_CanvasTkwin(canvas), drawable,
+ textInfoPtr->selBorder, points, 4,
+ textInfoPtr->selBorderWidth, TK_RELIEF_RAISED);
x = 0;
}
}
@@ -811,18 +908,28 @@ DisplayCanvText(
if ((textInfoPtr->focusItemPtr == itemPtr) && (textInfoPtr->gotFocus)) {
if (Tk_CharBbox(textPtr->textLayout, textPtr->insertPos,
&x, &y, NULL, &height)) {
- Tk_CanvasDrawableCoords(canvas,
- (double) (textPtr->leftEdge + x
- - (textInfoPtr->insertWidth / 2)),
- (double) (textPtr->header.y1 + y),
- &drawableX, &drawableY);
- Tk_SetCaretPos(Tk_CanvasTkwin(canvas), drawableX, drawableY,
+ int dx1, dy1, dx2, dy2;
+ double s = textPtr->sine, c = textPtr->cosine;
+ XPoint points[4];
+
+ dx1 = x - (textInfoPtr->insertWidth / 2);
+ dy1 = y;
+ dx2 = textInfoPtr->insertWidth;
+ dy2 = height;
+ points[0].x = drawableX + dx1*c + dy1*s;
+ points[0].y = drawableY + dy1*c - dx1*s;
+ points[1].x = drawableX + (dx1+dx2)*c + dy1*s;
+ points[1].y = drawableY + dy1*c - (dx1+dx2)*s;
+ points[2].x = drawableX + (dx1+dx2)*c + (dy1+dy2)*s;
+ points[2].y = drawableY + (dy1+dy2)*c - (dx1+dx2)*s;
+ points[3].x = drawableX + dx1*c + (dy1+dy2)*s;
+ points[3].y = drawableY + (dy1+dy2)*c - dx1*s;
+
+ Tk_SetCaretPos(Tk_CanvasTkwin(canvas), points[0].x, points[0].y,
height);
if (textInfoPtr->cursorOn) {
- Tk_Fill3DRectangle(Tk_CanvasTkwin(canvas), drawable,
- textInfoPtr->insertBorder,
- drawableX, drawableY,
- textInfoPtr->insertWidth, height,
+ Tk_Fill3DPolygon(Tk_CanvasTkwin(canvas), drawable,
+ textInfoPtr->insertBorder, points, 4,
textInfoPtr->insertBorderWidth, TK_RELIEF_RAISED);
} else if (textPtr->cursorOffGC != None) {
/*
@@ -832,10 +939,8 @@ DisplayCanvText(
* where both may be drawn in the same color.
*/
- XFillRectangle(display, drawable, textPtr->cursorOffGC,
- drawableX, drawableY,
- (unsigned) textInfoPtr->insertWidth,
- (unsigned) height);
+ XFillPolygon(display, drawable, textPtr->cursorOffGC,
+ points, 4, Convex, CoordModeOrigin);
}
}
}
@@ -850,23 +955,24 @@ DisplayCanvText(
* anti-aliasing colors would blend together.
*/
- Tk_CanvasDrawableCoords(canvas, (double) textPtr->leftEdge,
- (double) textPtr->header.y1, &drawableX, &drawableY);
-
if ((selFirstChar >= 0) && (textPtr->selTextGC != textPtr->gc)) {
- Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
- drawableX, drawableY, 0, selFirstChar);
- Tk_DrawTextLayout(display, drawable, textPtr->selTextGC,
- textPtr->textLayout, drawableX, drawableY, selFirstChar,
- selLastChar + 1);
- Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
- drawableX, drawableY, selLastChar + 1, -1);
+ TkDrawAngledTextLayout(display, drawable, textPtr->gc,
+ textPtr->textLayout, drawableX, drawableY, textPtr->angle,
+ 0, selFirstChar);
+ TkDrawAngledTextLayout(display, drawable, textPtr->selTextGC,
+ textPtr->textLayout, drawableX, drawableY, textPtr->angle,
+ selFirstChar, selLastChar + 1);
+ TkDrawAngledTextLayout(display, drawable, textPtr->gc,
+ textPtr->textLayout, drawableX, drawableY, textPtr->angle,
+ selLastChar + 1, -1);
} else {
- Tk_DrawTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
- drawableX, drawableY, 0, -1);
+ TkDrawAngledTextLayout(display, drawable, textPtr->gc,
+ textPtr->textLayout, drawableX, drawableY, textPtr->angle,
+ 0, -1);
}
- Tk_UnderlineTextLayout(display, drawable, textPtr->gc, textPtr->textLayout,
- drawableX, drawableY, textPtr->underline);
+ TkUnderlineAngledTextLayout(display, drawable, textPtr->gc,
+ textPtr->textLayout, drawableX, drawableY, textPtr->angle,
+ textPtr->underline);
if (stipple != None) {
XSetTSOrigin(display, textPtr->gc, 0, 0);
@@ -1076,15 +1182,17 @@ TextToPoint(
{
TextItem *textPtr;
Tk_State state = itemPtr->state;
- double value;
+ double value, px, py;
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
textPtr = (TextItem *) itemPtr;
+ px = pointPtr[0] - textPtr->drawOrigin[0];
+ py = pointPtr[1] - textPtr->drawOrigin[1];
value = (double) Tk_DistanceToTextLayout(textPtr->textLayout,
- (int) pointPtr[0] - textPtr->leftEdge,
- (int) pointPtr[1] - textPtr->header.y1);
+ (int) px*textPtr->cosine - py*textPtr->sine,
+ (int) py*textPtr->cosine + px*textPtr->sine);
if ((state == TK_STATE_HIDDEN) || (textPtr->color == NULL) ||
(textPtr->text == NULL) || (*textPtr->text == 0)) {
@@ -1128,11 +1236,12 @@ TextToArea(
}
textPtr = (TextItem *) itemPtr;
- return Tk_IntersectTextLayout(textPtr->textLayout,
- (int) (rectPtr[0] + 0.5) - textPtr->leftEdge,
- (int) (rectPtr[1] + 0.5) - textPtr->header.y1,
+ return TkIntersectAngledTextLayout(textPtr->textLayout,
+ (int) (rectPtr[0] + 0.5) - textPtr->drawOrigin[0],
+ (int) (rectPtr[1] + 0.5) - textPtr->drawOrigin[1],
(int) (rectPtr[2] - rectPtr[0] + 0.5),
- (int) (rectPtr[3] - rectPtr[1] + 0.5));
+ (int) (rectPtr[3] - rectPtr[1] + 0.5),
+ textPtr->angle);
}
/*
@@ -1261,7 +1370,7 @@ GetTextIndex(
*indexPtr = textInfoPtr->selectLast;
} else if (c == '@') {
int x, y;
- double tmp;
+ double tmp, c = textPtr->cosine, s = textPtr->sine;
char *end, *p;
p = string+1;
@@ -1276,9 +1385,9 @@ GetTextIndex(
goto badIndex;
}
y = (int) ((tmp < 0) ? tmp - 0.5 : tmp + 0.5);
- *indexPtr = Tk_PointToChar(textPtr->textLayout,
- x + canvasPtr->scrollX1 - textPtr->leftEdge,
- y + canvasPtr->scrollY1 - textPtr->header.y1);
+ x += canvasPtr->scrollX1 - textPtr->drawOrigin[0];
+ y += canvasPtr->scrollY1 - textPtr->drawOrigin[1];
+ *indexPtr = Tk_PointToChar(textPtr->textLayout, x*c-y*s, y*c+x*s);
} else if (Tcl_GetIntFromObj(NULL, obj, indexPtr) == TCL_OK) {
if (*indexPtr < 0) {
*indexPtr = 0;
@@ -1420,10 +1529,9 @@ TextToPostscript(
* being created. */
{
TextItem *textPtr = (TextItem *) itemPtr;
- int x, y;
+ double x, y;
Tk_FontMetrics fm;
const char *justify;
- char buffer[500];
XColor *color;
Pixmap stipple;
Tk_State state = itemPtr->state;
@@ -1437,17 +1545,17 @@ TextToPostscript(
textPtr->text == NULL || *textPtr->text == 0) {
return TCL_OK;
} else if (Canvas(canvas)->currentItemPtr == itemPtr) {
- if (textPtr->activeColor!=NULL) {
+ if (textPtr->activeColor != NULL) {
color = textPtr->activeColor;
}
- if (textPtr->activeStipple!=None) {
+ if (textPtr->activeStipple != None) {
stipple = textPtr->activeStipple;
}
- } else if (state==TK_STATE_DISABLED) {
- if (textPtr->disabledColor!=NULL) {
+ } else if (state == TK_STATE_DISABLED) {
+ if (textPtr->disabledColor != NULL) {
color = textPtr->disabledColor;
}
- if (textPtr->disabledStipple!=None) {
+ if (textPtr->disabledStipple != None) {
stipple = textPtr->disabledStipple;
}
}
@@ -1467,9 +1575,8 @@ TextToPostscript(
Tcl_AppendResult(interp, "} bind def\n", NULL);
}
- sprintf(buffer, "%.15g %.15g [\n", textPtr->x,
- Tk_CanvasPsY(canvas, textPtr->y));
- Tcl_AppendResult(interp, buffer, NULL);
+ Tcl_AppendPrintfToObj(Tcl_GetObjResult(interp), "%.15g %.15g %.15g [\n",
+ textPtr->angle, textPtr->x, Tk_CanvasPsY(canvas, textPtr->y));
Tk_TextLayoutToPostscript(interp, textPtr->textLayout);
@@ -1492,15 +1599,10 @@ TextToPostscript(
}
Tk_GetFontMetrics(textPtr->tkfont, &fm);
- sprintf(buffer, "] %d ", fm.linespace);
- Tcl_AppendResult(interp, buffer, NULL);
- Tcl_PrintDouble(NULL, x / -2.0, buffer);
- Tcl_AppendResult(interp, buffer, " ", NULL);
- Tcl_PrintDouble(NULL, y / 2.0, buffer);
- Tcl_AppendResult(interp, buffer, NULL);
- sprintf(buffer, " %s %s DrawText\n", justify,
+ Tcl_AppendPrintfToObj(Tcl_GetObjResult(interp),
+ "] %d %g %g %s %s DrawText\n",
+ fm.linespace, x / -2.0, y / 2.0, justify,
((stipple == None) ? "false" : "true"));
- Tcl_AppendResult(interp, buffer, NULL);
return TCL_OK;
}
diff --git a/generic/tkFont.c b/generic/tkFont.c
index a0fac74..c3b0e72 100644
--- a/generic/tkFont.c
+++ b/generic/tkFont.c
@@ -10,7 +10,7 @@
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tkFont.c,v 1.48 2008/11/02 09:54:02 nijtmans Exp $
+ * RCS: @(#) $Id: tkFont.c,v 1.49 2008/11/22 18:08:51 dkf Exp $
*/
#include "tkInt.h"
@@ -888,7 +888,7 @@ RecomputeWidgets(
Tk_GetClassProc(winPtr->classProcsPtr, worldChangedProc);
if (proc != NULL) {
- (*proc)(winPtr->instanceData);
+ proc(winPtr->instanceData);
}
/*
@@ -1347,7 +1347,7 @@ SetFontFromAny(
Tcl_GetString(objPtr);
typePtr = objPtr->typePtr;
if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) {
- (*typePtr->freeIntRepProc)(objPtr);
+ typePtr->freeIntRepProc(objPtr);
}
objPtr->typePtr = &tkFontObjType;
objPtr->internalRep.twoPtrValue.ptr1 = NULL;
@@ -2310,6 +2310,69 @@ Tk_DrawTextLayout(
}
}
+void
+TkDrawAngledTextLayout(
+ Display *display, /* Display on which to draw. */
+ Drawable drawable, /* Window or pixmap in which to draw. */
+ GC gc, /* Graphics context to use for drawing text. */
+ Tk_TextLayout layout, /* Layout information, from a previous call to
+ * Tk_ComputeTextLayout(). */
+ int x, int y, /* Upper-left hand corner of rectangle in
+ * which to draw (pixels). */
+ double angle,
+ int firstChar, /* The index of the first character to draw
+ * from the given text item. 0 specfies the
+ * beginning. */
+ int lastChar) /* The index just after the last character to
+ * draw from the given text item. A number < 0
+ * means to draw all characters. */
+{
+ TextLayout *layoutPtr = (TextLayout *) layout;
+ int i, numDisplayChars, drawX;
+ const char *firstByte, *lastByte;
+ LayoutChunk *chunkPtr;
+ double sinA = sin(angle * PI/180.0), cosA = cos(angle * PI/180.0);
+
+ if (layoutPtr == NULL) {
+ return;
+ }
+
+ if (lastChar < 0) {
+ lastChar = 100000000;
+ }
+ chunkPtr = layoutPtr->chunks;
+ for (i = 0; i < layoutPtr->numChunks; i++) {
+ numDisplayChars = chunkPtr->numDisplayChars;
+ if ((numDisplayChars > 0) && (firstChar < numDisplayChars)) {
+ double dx, dy;
+
+ if (firstChar <= 0) {
+ drawX = 0;
+ firstChar = 0;
+ firstByte = chunkPtr->start;
+ } else {
+ firstByte = Tcl_UtfAtIndex(chunkPtr->start, firstChar);
+ Tk_MeasureChars(layoutPtr->tkfont, chunkPtr->start,
+ firstByte - chunkPtr->start, -1, 0, &drawX);
+ }
+ if (lastChar < numDisplayChars) {
+ numDisplayChars = lastChar;
+ }
+ lastByte = Tcl_UtfAtIndex(chunkPtr->start, numDisplayChars);
+ dx = cosA * (chunkPtr->x + drawX) + sinA * (chunkPtr->y);
+ dy = -sinA * (chunkPtr->x + drawX) + cosA * (chunkPtr->y);
+ TkpDrawAngledChars(display, drawable, gc, layoutPtr->tkfont,
+ firstByte, lastByte - firstByte, x+dx, y+dy, angle);
+ }
+ firstChar -= chunkPtr->numChars;
+ lastChar -= chunkPtr->numChars;
+ if (lastChar <= 0) {
+ break;
+ }
+ chunkPtr++;
+ }
+}
+
/*
*---------------------------------------------------------------------------
*
@@ -2358,6 +2421,68 @@ Tk_UnderlineTextLayout(
}
}
+void
+TkUnderlineAngledTextLayout(
+ Display *display, /* Display on which to draw. */
+ Drawable drawable, /* Window or pixmap in which to draw. */
+ GC gc, /* Graphics context to use for drawing text. */
+ Tk_TextLayout layout, /* Layout information, from a previous call to
+ * Tk_ComputeTextLayout(). */
+ int x, int y, /* Upper-left hand corner of rectangle in
+ * which to draw (pixels). */
+ double angle,
+ int underline) /* Index of the single character to underline,
+ * or -1 for no underline. */
+{
+ int xx, yy, width, height;
+
+ if (angle == 0.0) {
+ Tk_UnderlineTextLayout(display, drawable, gc, layout, x,y, underline);
+ return;
+ }
+
+ if ((Tk_CharBbox(layout, underline, &xx, &yy, &width, &height) != 0)
+ && (width != 0)) {
+ TextLayout *layoutPtr = (TextLayout *) layout;
+ TkFont *fontPtr = (TkFont *) layoutPtr->tkfont;
+ double sinA = sin(angle*PI/180), cosA = cos(angle*PI/180);
+ double dy = yy + fontPtr->fm.ascent + fontPtr->underlinePos;
+ XPoint points[5];
+
+ /*
+ * Note that we're careful to only round a double value once, which
+ * minimizes roundoff errors.
+ */
+
+ points[0].x = x + round(xx*cosA + dy*sinA);
+ points[0].y = y + round(dy*cosA - xx*sinA);
+ points[1].x = x + round(xx*cosA + dy*sinA + width*cosA);
+ points[1].y = y + round(dy*cosA - xx*sinA - width*sinA);
+ if (fontPtr->underlineHeight == 1) {
+ /*
+ * Thin underlines look better when rotated when drawn as a line
+ * rather than a rectangle; the rasterizer copes better.
+ */
+
+ XDrawLines(display, drawable, gc, points, 2, CoordModeOrigin);
+ } else {
+ points[2].x = x + round(xx*cosA + dy*sinA + width*cosA
+ - fontPtr->underlineHeight*sinA);
+ points[2].y = y + round(dy*cosA - xx*sinA - width*sinA
+ + fontPtr->underlineHeight*cosA);
+ points[3].x = x + round(xx*cosA + dy*sinA
+ - fontPtr->underlineHeight*sinA);
+ points[3].y = y + round(dy*cosA - xx*sinA
+ + fontPtr->underlineHeight*cosA);
+ points[4].x = points[0].x;
+ points[4].y = points[0].y;
+ XFillPolygon(display, drawable, gc, points, 5, Complex,
+ CoordModeOrigin);
+ XDrawLines(display, drawable, gc, points, 5, CoordModeOrigin);
+ }
+ }
+}
+
/*
*---------------------------------------------------------------------------
*
@@ -2806,6 +2931,263 @@ Tk_IntersectTextLayout(
/*
*---------------------------------------------------------------------------
*
+ * TkIntersectAngledTextLayout --
+ *
+ * Determines whether a text layout that has been turned by an angle
+ * about its top-left coordinae lies entirely inside, entirely outside,
+ * or overlaps a given rectangle. Non-displaying space characters that
+ * occur at the end of individual lines in the text layout are ignored
+ * for intersection calculations.
+ *
+ * Results:
+ * The return value is -1 if the text layout is entirely outside of the
+ * rectangle, 0 if it overlaps, and 1 if it is entirely inside of the
+ * rectangle.
+ *
+ * Side effects:
+ * None.
+ *
+ *---------------------------------------------------------------------------
+ */
+
+static inline int
+PointInQuadrilateral(
+ double qx[],
+ double qy[],
+ double x,
+ double y)
+{
+ int i;
+
+ for (i=0 ; i<4 ; i++) {
+ double sideDX = qx[(i+1)%4] - qx[i];
+ double sideDY = qy[(i+1)%4] - qy[i];
+ double dx = x - qx[i];
+ double dy = y - qy[i];
+
+ if (sideDX*dy < sideDY*dx) {
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static inline int
+sign(
+ double value)
+{
+ if (value < 0.0) return -1;
+ if (value > 0.0) return 1;
+ return 0;
+}
+
+static inline int
+SidesIntersect(
+ double ax1, double ay1, double ax2, double ay2,
+ double bx1, double by1, double bx2, double by2)
+{
+#if 0
+/* http://www.freelunchdesign.com/cgi-bin/codwiki.pl?DiscussionTopics/CollideMeUpBaby */
+
+ double a1, b1, c1, a2, b2, c2, r1, r2, r3, r4, denom;
+
+ a1 = ay2 - ay1;
+ b1 = ax1 - ax2;
+ c1 = (ax2 * ay1) - (ax1 * ay2);
+ r3 = (a1 * bx1) + (b1 * by1) + c1;
+ r4 = (a1 * bx2) + (b1 * by2) + c1;
+ if ((r3 != 0.0) && (r4 != 0.0) && (r3*r4 > 0.0)) {
+ return 0;
+ }
+
+ a2 = by2 - by1;
+ b2 = bx1 - bx2;
+ c2 = (bx2 * by1) - (bx1 * by2);
+ r1 = (a2 * ax1) + (b2 * ay1) + c2;
+ r2 = (a2 * ax2) + (b2 * ay2) + c2;
+ if ((r1 != 0.0) && (r2 != 0.0) && (r1*r2 > 0.0)) {
+ return 0;
+ }
+
+ denom = (a1 * b2) - (a2 * b1);
+ return (denom != 0.0);
+#else
+ /*
+ * A more efficient version. Two line segments intersect if, when seen
+ * from the perspective of one line, the two endpoints of the other
+ * segment lie on opposite sides of the line, and vice versa. "Lie on
+ * opposite sides" is computed by taking the cross products and seeing if
+ * they are of opposite signs.
+ */
+
+ double dx, dy, dx1, dy1;
+
+ dx = ax2 - ax1;
+ dy = ay2 - ay1;
+ dx1 = bx1 - ax1;
+ dy1 = by1 - ay1;
+ if ((dx*dy1-dy*dx1 > 0.0) == (dx*(by2-ay1)-dy*(bx2-ax1) > 0.0)) {
+ return 0;
+ }
+ dx = bx2 - bx1;
+ dy = by2 - by1;
+ if ((dy*dx1-dx*dy1 > 0.0) == (dx*(ay2-by1)-dy*(ax2-bx1) > 0.0)) {
+ return 0;
+ }
+ return 1;
+#endif
+}
+
+int
+TkIntersectAngledTextLayout(
+ Tk_TextLayout layout, /* Layout information, from a previous call to
+ * Tk_ComputeTextLayout(). */
+ int x, int y, /* Upper-left hand corner, in pixels, of
+ * rectangular area to compare with text
+ * layout. Coordinates are with respect to the
+ * upper-left hand corner of the text layout
+ * itself. */
+ int width, int height, /* The width and height of the above
+ * rectangular area, in pixels. */
+ double angle)
+{
+ int i, x1, y1, x2, y2;
+ TextLayout *layoutPtr;
+ LayoutChunk *chunkPtr;
+ TkFont *fontPtr;
+ double c = cos(angle * PI/180.0), s = sin(angle * PI/180.0);
+ double rx[4], ry[4];
+
+ if (angle == 0.0) {
+ return Tk_IntersectTextLayout(layout, x, y, width, height);
+ }
+
+ /*
+ * Compute the coordinates of the rectangle, rotated into text layout
+ * space.
+ */
+
+ rx[0] = x*c - y*s;
+ ry[0] = y*c + x*s;
+ rx[1] = (x+width)*c - y*s;
+ ry[1] = y*c + (x+width)*s;
+ rx[2] = (x+width)*c - (y+height)*s;
+ ry[2] = (y+height)*c + (x+width)*s;
+ rx[3] = x*c - (y+height)*s;
+ ry[3] = (y+height)*c + x*s;
+
+ /*
+ * Want to know if all chunks are inside the rectangle, or if there is any
+ * overlap. First, we check to see if all chunks are inside; if and only
+ * if they are, we're in the "inside" case.
+ */
+
+ layoutPtr = (TextLayout *) layout;
+ chunkPtr = layoutPtr->chunks;
+ fontPtr = (TkFont *) layoutPtr->tkfont;
+
+ for (i=0 ; i<layoutPtr->numChunks ; i++,chunkPtr++) {
+ if (chunkPtr->start[0] == '\n') {
+ /*
+ * Newline characters are not counted when computing area
+ * intersection (but tab characters would still be considered).
+ */
+
+ continue;
+ }
+
+ x1 = chunkPtr->x;
+ y1 = chunkPtr->y - fontPtr->fm.ascent;
+ x2 = chunkPtr->x + chunkPtr->displayWidth;
+ y2 = chunkPtr->y + fontPtr->fm.descent;
+ if ( !PointInQuadrilateral(rx, ry, x1, y1) ||
+ !PointInQuadrilateral(rx, ry, x2, y1) ||
+ !PointInQuadrilateral(rx, ry, x2, y2) ||
+ !PointInQuadrilateral(rx, ry, x1, y2)) {
+ goto notInside;
+ }
+ }
+ return 1;
+
+ /*
+ * Next, check to see if all the points of the rectangle are inside a
+ * single chunk; if they are, we're in an "overlap" case.
+ */
+
+ notInside:
+ chunkPtr = layoutPtr->chunks;
+
+ for (i=0 ; i<layoutPtr->numChunks ; i++,chunkPtr++) {
+ double cx[4], cy[4];
+ if (chunkPtr->start[0] == '\n') {
+ /*
+ * Newline characters are not counted when computing area
+ * intersection (but tab characters would still be considered).
+ */
+
+ continue;
+ }
+
+ cx[0] = cx[3] = chunkPtr->x;
+ cy[0] = cy[1] = chunkPtr->y - fontPtr->fm.ascent;
+ cx[1] = cx[2] = chunkPtr->x + chunkPtr->displayWidth;
+ cy[2] = cy[3] = chunkPtr->y + fontPtr->fm.descent;
+ if ( !PointInQuadrilateral(cx, cy, rx[0], ry[0]) ||
+ !PointInQuadrilateral(cx, cy, rx[1], ry[1]) ||
+ !PointInQuadrilateral(cx, cy, rx[2], ry[2]) ||
+ !PointInQuadrilateral(cx, cy, rx[3], ry[3])) {
+ goto notReverseInside;
+ }
+ }
+ return 0;
+
+ /*
+ * If we're overlapping now, we must be partially in and out of at least
+ * one chunk. If that is the case, there must be one line segment of the
+ * rectangle that is touching or crossing a line segment of a chunk.
+ */
+
+ notReverseInside:
+ chunkPtr = layoutPtr->chunks;
+
+ for (i=0 ; i<layoutPtr->numChunks ; i++,chunkPtr++) {
+ int j;
+
+ if (chunkPtr->start[0] == '\n') {
+ /*
+ * Newline characters are not counted when computing area
+ * intersection (but tab characters would still be considered).
+ */
+
+ continue;
+ }
+
+ x1 = chunkPtr->x;
+ y1 = chunkPtr->y - fontPtr->fm.ascent;
+ x2 = chunkPtr->x + chunkPtr->displayWidth;
+ y2 = chunkPtr->y + fontPtr->fm.descent;
+
+ for (j=0 ; j<4 ; j++) {
+ int k = (j+1) % 4;
+ if ( SidesIntersect(rx[j],ry[j], rx[k],ry[k], x1,y1, x2,y1) ||
+ SidesIntersect(rx[j],ry[j], rx[k],ry[k], x2,y1, x2,y2) ||
+ SidesIntersect(rx[j],ry[j], rx[k],ry[k], x2,y2, x1,y2) ||
+ SidesIntersect(rx[j],ry[j], rx[k],ry[k], x1,y2, x1,y1)) {
+ return 0;
+ }
+ }
+ }
+
+ /*
+ * They must be wholly non-overlapping.
+ */
+
+ return -1;
+}
+
+/*
+ *---------------------------------------------------------------------------
+ *
* Tk_TextLayoutToPostscript --
*
* Outputs the contents of a text layout in Postscript format. The set of
diff --git a/generic/tkInt.h b/generic/tkInt.h
index 10fff59..5fe85e1 100644
--- a/generic/tkInt.h
+++ b/generic/tkInt.h
@@ -11,7 +11,7 @@
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: $Id: tkInt.h,v 1.92 2008/11/09 21:53:39 nijtmans Exp $
+ * RCS: $Id: tkInt.h,v 1.93 2008/11/22 18:08:51 dkf Exp $
*/
#ifndef _TKINT
@@ -956,6 +956,19 @@ MODULE_SCOPE TkMainInfo *tkMainWindowList;
MODULE_SCOPE Tk_ImageType tkPhotoImageType;
MODULE_SCOPE Tcl_HashTable tkPredefBitmapTable;
+/*
+ * The definition of pi, at least from the perspective of double-precision
+ * floats.
+ */
+
+#ifndef PI
+#define PI 3.14159265358979323846
+#endif
+
+/*
+ * Exported internals.
+ */
+
#include "tkIntDecls.h"
#ifdef BUILD_tk
@@ -1214,6 +1227,19 @@ MODULE_SCOPE void TkpCreateBusy(Tk_FakeWin *winPtr, Tk_Window tkRef,
Window *parentPtr, Tk_Window tkParent,
TkBusy busy);
+MODULE_SCOPE void TkDrawAngledTextLayout(Display *display,
+ Drawable drawable, GC gc, Tk_TextLayout layout,
+ int x, int y, double angle, int firstChar,
+ int lastChar);
+MODULE_SCOPE void TkpDrawAngledChars(Display *display,Drawable drawable,
+ GC gc, Tk_Font tkfont, const char *source,
+ int numBytes, double x, double y, double angle);
+MODULE_SCOPE void TkUnderlineAngledTextLayout(Display *display,
+ Drawable drawable, GC gc, Tk_TextLayout layout,
+ int x, int y, double angle, int underline);
+MODULE_SCOPE int TkIntersectAngledTextLayout(Tk_TextLayout layout,
+ int x,int y, int width, int height, double angle);
+
/*
* Unsupported commands.
*/
generated by cgit v0.12 at 2024-11-09 15:57:21 (GMT)