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Draw curve with cairo

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This commit is contained in:
Paul Dicker
2025-04-01 07:54:38 +02:00
committed by Stéphane Lesimple
parent f3226aaf68
commit a00dee7240
1 changed files with 110 additions and 73 deletions
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183
src/curve.c
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@@ -170,30 +170,33 @@ void GuiUpdateCurveGeometry(Curve *curve, char *largest_left_label, int right_pa
***/
void GuiRedrawAxes(Curve *curve)
{ GdkDrawable *d = curve->widget->window;
{ cairo_t *cr = gdk_cairo_create(gtk_widget_get_window(curve->widget));
int i,w,h,x,y;
int yg=0;
int step;
int bottom_y;
/* Draw and label the left coordinate axis */
cairo_set_line_cap(cr, CAIRO_LINE_CAP_SQUARE);
cairo_set_line_width(cr, 1);
gdk_cairo_set_source_color(cr, Closure->foreground);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->foreground);
gdk_draw_line(d, Closure->drawGC,
curve->leftX, curve->topY, curve->leftX, curve->bottomY);
cairo_move_to(cr, curve->leftX + 0.5, curve->topY + 0.5);
cairo_line_to(cr, curve->leftX + 0.5, curve->bottomY + 0.5);
cairo_stroke(cr);
if(curve->enable & DRAW_LCURVE)
{ gdk_draw_line(d, Closure->drawGC,
curve->leftX, curve->topLY, curve->leftX, curve->bottomLY);
{ cairo_move_to(cr, curve->leftX + 0.5, curve->topLY + 0.5);
cairo_line_to(cr, curve->leftX + 0.5, curve->bottomLY + 0.5);
cairo_stroke(cr);
}
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->curveColor);
gdk_cairo_set_source_color(cr, Closure->curveColor);
GuiSetText(curve->layout, curve->leftLabel, &w, &h);
x = curve->leftX - w/2;
if(x < 5) x = 5;
gdk_draw_layout(d, Closure->drawGC,
x, curve->topY - h - 5, curve->layout);
cairo_move_to(cr, x, curve->topY - h - 5);
pango_cairo_show_layout(cr, curve->layout);
/* Draw and label the grid lines for the log curve */
@@ -202,37 +205,45 @@ void GuiRedrawAxes(Curve *curve)
{ int val;
char buf[16];
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->logColor);
gdk_cairo_set_source_color(cr, Closure->logColor);
GuiSetText(curve->layout, curve->leftLogLabel, &w, &h);
x = curve->leftX - w/2;
if(x < 5) x = 5;
gdk_draw_layout(d, Closure->drawGC,
x, curve->topLY - h - 5, curve->layout);
cairo_move_to(cr, x, curve->topLY - h - 5);
pango_cairo_show_layout(cr, curve->layout);
for(val=400; val>3; val/=2)
{ y = GuiCurveLogY(curve, val);
sprintf(buf,"%d",val);
GuiSetText(curve->layout, buf, &w, &h);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->logColor);
gdk_draw_layout(d, Closure->drawGC, curve->leftX-9-w, y-h/2, curve->layout);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->foreground);
gdk_draw_line(d, Closure->drawGC, curve->leftX-6, y, curve->leftX, y);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->grid);
gdk_draw_line(d, Closure->drawGC, curve->leftX, y, curve->rightX, y);
sprintf(buf,"%d",val);
GuiSetText(curve->layout, buf, &w, &h);
gdk_cairo_set_source_color(cr, Closure->logColor);
cairo_move_to(cr, curve->leftX-9-w, y-h/2);
pango_cairo_show_layout(cr, curve->layout);
gdk_cairo_set_source_color(cr, Closure->foreground);
cairo_move_to(cr, curve->leftX-6 + 0.5, y + 0.5);
cairo_line_to(cr, curve->leftX + 0.5, y + 0.5);
cairo_stroke(cr);
gdk_cairo_set_source_color(cr, Closure->grid);
cairo_move_to(cr, curve->leftX + 0.5, y + 0.5);
cairo_line_to(cr, curve->rightX + 0.5, y + 0.5);
cairo_stroke(cr);
val /=2;
y = GuiCurveLogY(curve, val);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->foreground);
gdk_draw_line(d, Closure->drawGC, curve->leftX-3, y, curve->leftX, y);
val /=2;
y = GuiCurveLogY(curve, val);
gdk_cairo_set_source_color(cr, Closure->foreground);
cairo_move_to(cr, curve->leftX-3 + 0.5, y + 0.5);
cairo_line_to(cr, curve->leftX + 0.5, y + 0.5);
cairo_stroke(cr);
if(curve->bottomLY-curve->topLY > 8*h)
{ sprintf(buf,"%d",val);
GuiSetText(curve->layout, buf, &w, &h);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->logColor);
gdk_draw_layout(d, Closure->drawGC, curve->leftX-9-w, y-h/2, curve->layout);
}
if(curve->bottomLY-curve->topLY > 8*h)
{ sprintf(buf,"%d",val);
GuiSetText(curve->layout, buf, &w, &h);
gdk_cairo_set_source_color(cr, Closure->logColor);
cairo_move_to(cr, curve->leftX-9-w, y-h/2);
pango_cairo_show_layout(cr, curve->layout);
}
}
}
@@ -248,42 +259,55 @@ void GuiRedrawAxes(Curve *curve)
GuiSetText(curve->layout, buf, &w, &h);
y = yg = GuiCurveY(curve, i);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->curveColor);
gdk_draw_layout(d, Closure->drawGC, curve->leftX-9-w, y-h/2, curve->layout);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->foreground);
gdk_draw_line(d, Closure->drawGC, curve->leftX-6, y, curve->leftX, y);
gdk_cairo_set_source_color(cr, Closure->curveColor);
cairo_move_to(cr, curve->leftX-9-w, y-h/2);
pango_cairo_show_layout(cr, curve->layout);
gdk_cairo_set_source_color(cr, Closure->foreground);
cairo_move_to(cr, curve->leftX-6 + 0.5, y + 0.5);
cairo_line_to(cr, curve->leftX + 0.5, y + 0.5);
cairo_stroke(cr);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->grid);
gdk_draw_line(d, Closure->drawGC, curve->leftX, y, curve->rightX, y);
gdk_cairo_set_source_color(cr, Closure->grid);
cairo_move_to(cr, curve->leftX + 0.5, y + 0.5);
cairo_line_to(cr, curve->rightX + 0.5, y + 0.5);
cairo_stroke(cr);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->foreground);
gdk_cairo_set_source_color(cr, Closure->foreground);
y = GuiCurveY(curve, i+step/2);
if(y >= curve->topY)
gdk_draw_line(d, Closure->drawGC, curve->leftX-3, y, curve->leftX, y);
if(y >= curve->topY) {
cairo_move_to(cr, curve->leftX-3 + 0.5, y + 0.5);
cairo_line_to(cr, curve->leftX + 0.5, y + 0.5);
cairo_stroke(cr);
}
}
/* Draw the right coordinate axis */
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->foreground);
gdk_cairo_set_source_color(cr, Closure->foreground);
gdk_draw_line(d, Closure->drawGC,
curve->rightX, curve->topY, curve->rightX, curve->bottomY);
cairo_move_to(cr, curve->rightX + 0.5, curve->topY + 0.5);
cairo_line_to(cr, curve->rightX + 0.5, curve->bottomY + 0.5);
cairo_stroke(cr);
if(curve->enable & DRAW_LCURVE)
gdk_draw_line(d, Closure->drawGC,
curve->rightX, curve->topLY, curve->rightX, curve->bottomLY);
if(curve->enable & DRAW_LCURVE) {
cairo_move_to(cr, curve->rightX + 0.5, curve->topLY + 0.5);
cairo_line_to(cr, curve->rightX + 0.5, curve->bottomLY + 0.5);
cairo_stroke(cr);
}
/* Draw and label the bottom coordinate axis */
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->foreground);
gdk_cairo_set_source_color(cr, Closure->foreground);
gdk_draw_line(d, Closure->drawGC,
curve->leftX, curve->bottomY, curve->rightX, curve->bottomY);
cairo_move_to(cr, curve->leftX + 0.5, curve->bottomY + 0.5);
cairo_line_to(cr, curve->rightX + 0.5, curve->bottomY + 0.5);
cairo_stroke(cr);
if(curve->enable & DRAW_LCURVE)
{ gdk_draw_line(d, Closure->drawGC,
curve->leftX, curve->bottomLY, curve->rightX, curve->bottomLY);
{ cairo_move_to(cr, curve->leftX + 0.5, curve->bottomLY + 0.5);
cairo_line_to(cr, curve->rightX + 0.5, curve->bottomLY + 0.5);
cairo_stroke(cr);
bottom_y = curve->bottomLY;
}
else bottom_y = curve->bottomY;
@@ -312,21 +336,32 @@ void GuiRedrawAxes(Curve *curve)
GuiSetText(curve->layout, buf, &w, &h);
x = GuiCurveLX(curve,i)-1;
gdk_draw_line(d, Closure->drawGC, x, bottom_y+6, x, bottom_y);
gdk_draw_layout(d, Closure->drawGC, x-w/2, bottom_y+8, curve->layout);
cairo_move_to(cr, x + 0.5, bottom_y+6 + 0.5);
cairo_line_to(cr, x + 0.5, bottom_y + 0.5);
cairo_stroke(cr);
cairo_move_to(cr, x-w/2, bottom_y+8);
pango_cairo_show_layout(cr, curve->layout);
if(i && x < curve->rightX)
{ gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->grid);
gdk_draw_line(d, Closure->drawGC, x, curve->bottomY-1, x, yg);
{ gdk_cairo_set_source_color(cr, Closure->grid);
cairo_move_to(cr, x + 0.5, curve->bottomY-1 + 0.5);
cairo_line_to(cr, x + 0.5, yg + 0.5);
cairo_stroke(cr);
if(curve->enable & DRAW_LCURVE)
gdk_draw_line(d, Closure->drawGC, x, curve->bottomLY-1, x, curve->topLY);
if(curve->enable & DRAW_LCURVE) {
cairo_move_to(cr, x + 0.5, curve->bottomLY-1 + 0.5);
cairo_line_to(cr, x + 0.5, curve->topLY + 0.5);
cairo_stroke(cr);
}
}
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->foreground);
gdk_cairo_set_source_color(cr, Closure->foreground);
x = GuiCurveLX(curve,i+step/2)-1;
if(x < curve->rightX)
gdk_draw_line(d, Closure->drawGC, x, bottom_y+3, x, bottom_y);
if(x < curve->rightX) {
cairo_move_to(cr, x + 0.5, bottom_y+3 + 0.5);
cairo_line_to(cr, x + 0.5, bottom_y + 0.5);
cairo_stroke(cr);
}
}
}
@@ -335,12 +370,14 @@ void GuiRedrawAxes(Curve *curve)
*/
void GuiRedrawCurve(Curve *curve, int last)
{ int i,x0,x1,fy0,fy1;
{ cairo_t *cr = gdk_cairo_create(gtk_widget_get_window(curve->widget));
int i,x0,x1,fy0,fy1;
x0 = GuiCurveX(curve, 0);
fy0 = GuiCurveY(curve, curve->fvalue[0]);
gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->curveColor);
gdk_cairo_set_source_color(cr, Closure->curveColor);
cairo_set_line_width(cr, 1.0);
/* Draw the curve */
@@ -351,10 +388,9 @@ void GuiRedrawCurve(Curve *curve, int last)
{ int iy = GuiCurveY(curve, curve->ivalue[i]);
if(curve->ivalue[i] > 0)
{ gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->barColor);
gdk_draw_rectangle(curve->widget->window,
Closure->drawGC, TRUE,
x0, iy, x0==x1 ? 1 : x1-x0, curve->bottomY-iy);
{ gdk_cairo_set_source_color(cr, Closure->barColor);
cairo_rectangle(cr, x0, iy, x0==x1 ? 1 : x1-x0, curve->bottomY-iy);
cairo_fill(cr);
}
}
@@ -362,19 +398,20 @@ void GuiRedrawCurve(Curve *curve, int last)
{ int iy = GuiCurveLogY(curve, curve->lvalue[i]);
if(curve->lvalue[i] > 0)
{ gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->logColor);
gdk_draw_rectangle(curve->widget->window,
Closure->drawGC, TRUE,
x0, iy, x0==x1 ? 1 : x1-x0, curve->bottomLY-iy);
}
{ gdk_cairo_set_source_color(cr, Closure->logColor);
cairo_rectangle(cr, x0, iy, x0==x1 ? 1 : x1-x0, curve->bottomLY-iy);
cairo_fill(cr);
}
}
if(curve->enable & DRAW_FCURVE && curve->fvalue[i] >= 0)
{ fy1 = GuiCurveY(curve, curve->fvalue[i]);
if(x0 < x1)
{ gdk_gc_set_rgb_fg_color(Closure->drawGC, Closure->curveColor);
gdk_draw_line(curve->widget->window, Closure->drawGC, x0, fy0, x1, fy1);
{ gdk_cairo_set_source_color(cr, Closure->curveColor);
cairo_move_to(cr, x0, fy0);
cairo_line_to(cr, x1, fy1);
cairo_stroke(cr);
fy0 = fy1;
}
}