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negative scroll fix

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fix for Microsoft/pxt#813
This commit is contained in:
Peli de Halleux 2017-01-09 14:17:19 -08:00
parent 64aa0fd6f5
commit 5d861e1e6d
1 changed files with 11 additions and 6 deletions
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15
sim/state/ledmatrix.ts
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@ -53,9 +53,9 @@ namespace pxsim {
}
public shiftRight(cols: number) {
for (let x = this.width - 1; x <= 0; --x)
for (let x = this.width - 1; x >= 0; --x)
for (let y = 0; y < 5; ++y)
this.set(x, y, x > cols ? this.get(x - cols, y) : 0);
this.set(x, y, x >= cols ? this.get(x - cols, y) : 0);
}
public clear(): void {
@ -195,11 +195,16 @@ namespace pxsim.ImageMethods {
board().ledMatrixState.animationQ.enqueue({
interval: interval,
frame: () => {
//TODO: support right to left.
if (off >= leds.width || off < 0) return false;
stride > 0 ? display.shiftLeft(stride) : display.shiftRight(-stride);
let c = Math.min(stride, leds.width - off);
if (stride > 0) {
display.shiftLeft(stride);
const c = Math.min(stride, leds.width - off);
leds.copyTo(off, c, display, 5 - stride)
} else {
display.shiftRight(-stride);
const c = Math.min(-stride, leds.width - off);
leds.copyTo(off, c, display, 0)
}
off += stride;
return true;
},