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added canvas size methods; transformations now apply in reverse order

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This commit is contained in:
Thomas Friedel 2018-02-12 18:53:05 +01:00
parent d6b0dc454b
commit 59033ea55b
1 changed files with 14 additions and 4 deletions
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18
canvas.go
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@ -93,6 +93,16 @@ func New(x, y, w, h int) *Canvas {
return cv return cv
} }
func (cv *Canvas) SetSize(w, h int) {
cv.w, cv.h = w, h
cv.fw, cv.fh = float32(w), float32(h)
activeCanvas = nil
}
func (cv *Canvas) W() int { return cv.w }
func (cv *Canvas) H() int { return cv.h }
func (cv *Canvas) Size() (int, int) { return cv.w, cv.h }
func (cv *Canvas) tf(v lm.Vec2) lm.Vec2 { func (cv *Canvas) tf(v lm.Vec2) lm.Vec2 {
v, _ = v.MulMat3x3(cv.state.transform) v, _ = v.MulMat3x3(cv.state.transform)
return v return v
@ -474,19 +484,19 @@ func (cv *Canvas) Restore() {
} }
func (cv *Canvas) Scale(x, y float32) { func (cv *Canvas) Scale(x, y float32) {
cv.state.transform = cv.state.transform.Mul(lm.Mat3x3Scale(lm.Vec2{x, y})) cv.state.transform = lm.Mat3x3Scale(lm.Vec2{x, y}).Mul(cv.state.transform)
} }
func (cv *Canvas) Translate(x, y float32) { func (cv *Canvas) Translate(x, y float32) {
cv.state.transform = cv.state.transform.Mul(lm.Mat3x3Translate(lm.Vec2{x, y})) cv.state.transform = lm.Mat3x3Translate(lm.Vec2{x, y}).Mul(cv.state.transform)
} }
func (cv *Canvas) Rotate(angle float32) { func (cv *Canvas) Rotate(angle float32) {
cv.state.transform = cv.state.transform.Mul(lm.Mat3x3Rotate(angle)) cv.state.transform = lm.Mat3x3Rotate(angle).Mul(cv.state.transform)
} }
func (cv *Canvas) Transform(a, b, c, d, e, f float32) { func (cv *Canvas) Transform(a, b, c, d, e, f float32) {
cv.state.transform = cv.state.transform.Mul(lm.Mat3x3{a, b, 0, c, d, 0, e, f, 1}) cv.state.transform = lm.Mat3x3{a, b, 0, c, d, 0, e, f, 1}.Mul(cv.state.transform)
} }
func (cv *Canvas) SetTransform(a, b, c, d, e, f float32) { func (cv *Canvas) SetTransform(a, b, c, d, e, f float32) {