141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
// 4 september 2015
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typedef struct uiArea uiArea;
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typedef struct uiAreaHandler uiAreaHandler;
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typedef struct uiAreaDrawParams uiAreaDrawParams;
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typedef struct uiDrawContext uiDrawContext;
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struct uiAreaHandler {
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void (*Draw)(uiAreaHandler *, uiArea *, uiAreaDrawParams *);
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uintmax_t (*HScrollMax)(uiAreaHandler *, uiArea *);
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uintmax_t (*VScrollMax)(uiAreaHandler *, uiArea *);
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};
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struct uiAreaDrawParams {
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uiDrawContext *Context;
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intmax_t ClientWidth;
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intmax_t ClientHeight;
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intmax_t ClipX;
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intmax_t ClipY;
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intmax_t ClipWidth;
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intmax_t ClipHeight;
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int DPIX;
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int DPIY;
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intmax_t HScrollPos;
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intmax_t VScrollPos;
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};
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// TODO proper sources
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// TODO dotting/dashing
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typedef struct uiDrawStrokeParams uiDrawStrokeParams;
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typedef enum uiDrawLineCap uiDrawLineCap;
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typedef enum uiDrawLineJoin uiDrawLineJoin;
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typedef enum uiDrawFillMode uiDrawFillMode;
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enum uiDrawLineCap {
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uiDrawLineCapFlat,
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uiDrawLineCapRound,
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uiDrawLineCapSquare,
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};
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enum uiDrawLineJoin {
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uiDrawLineJoinMiter,
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uiDrawLineJoinRound,
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uiDrawLineJoinBevel,
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};
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// this is the default for botoh cairo and GDI
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// Core Graphics doesn't explicitly specify a default, but NSBezierPath allows you to choose one, and this is the initial value
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// so we're good to use it too!
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#define uiDrawDefaultMiterLimit 10.0
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// TODOs
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// - os x: FillPath/EOFillPath functions
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enum uiDrawFillMode {
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uiDrawFillModeWinding,
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// TODO rename to EvenOdd?
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uiDrawFillModeAlternate,
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};
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struct uiDrawStrokeParams {
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uiDrawLineCap Cap;
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uiDrawLineJoin Join;
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intmax_t Thickness;
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// TODO float for GDI?
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double MiterLimit;
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};
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void uiDrawBeginPathRGB(uiDrawContext *, uint8_t, uint8_t, uint8_t);
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void uiDrawBeginPathRGBA(uiDrawContext *, uint8_t, uint8_t, uint8_t, uint8_t);
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void uiDrawMoveTo(uiDrawContext *, intmax_t, intmax_t);
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void uiDrawLineTo(uiDrawContext *, intmax_t, intmax_t);
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void uiDrawRectangle(uiDrawContext *, intmax_t, intmax_t, intmax_t, intmax_t);
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// notes: angles are both relative to 0 and go counterclockwise
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void uiDrawArc(uiDrawContext *, intmax_t, intmax_t, intmax_t, double, double, int);
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// TODO behavior when there is no initial point on Windows and OS X
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void uiDrawBezierTo(uiDrawContext *, intmax_t, intmax_t, intmax_t, intmax_t, intmax_t, intmax_t);
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void uiDrawCloseFigure(uiDrawContext *);
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void uiDrawStroke(uiDrawContext *, uiDrawStrokeParams *);
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void uiDrawFill(uiDrawContext *, uiDrawFillMode);
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// path functions
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// cairo gdi core graphics
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// move_to MoveToEx MoveToPoint
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// line_to LineTo AddLineToPoint
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// arc Arc/ArcTo/AngleArc/Pie AddArc/AddArcToPoint/AddEllipseInRect
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// arc_negative Arc/ArcTo/AngleArc/Pie AddArc/AddArcToPoint
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// curve_to PolyBezier/PolyBezierTo AddCurveToPoint
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// rectangle Rectangle AddRect
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// [arc functions?] Chord [arc functions?]
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// [combination] RoundRect [same way as cairo?]
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// [TODO pango] TextOut/ExtTextOut [TODO core text]
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// [TODO] [TODO] AddQuadCurveToPoint
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// on sources:
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// cairo:
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// - RGB
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// - RGBA
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// - images
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// - linear gradients, RGB or RGBA
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// - rounded gradients, RGB or RGBA
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// gdi:
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// - RGB
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// - hatches
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// - images
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// we can create a linear gradient image, but RGB only, and of finite size
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// core graphics:
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// - arbitrary patterns
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// - solid colors, arbitrary spaces
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// - shadows
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// arcs
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// cairo_arc/arc_negative
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// - parameters: center, radius, angle1 radians, angle2 radins
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// - if angle2 < angle1, TODO
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// - if angle2 > angle1, TODO
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// - line segment from current point to beginning of arc
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// - arc: clockwise, arc_negative: counterclockwise
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// - circular
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// GDI Arc/Pie
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// - parameters: bounding box, start point, end point
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// - current position not used/changed
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// - either clockwise or counterclockwise
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// - elliptical
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// GDI ArcTo
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// - same as Arc except line segment from current point to beginning of arc
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// - there does not appear to be a PieTo
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// GDI AngleArc
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// - parameters: center, radius, angle1 degrees, angle2 degrees
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// - line segment from current position to beginning of arc
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// - counterclockwise
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// - circular
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// - can be used to draw pies too; MSDN example demonstrates
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