nemunaire/waveshareteam-e-Paper
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Fix pixel coordinate calculation for rotated displays

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Coordinate ranges are from 0 to width-1 (or height-1). This means when calculating the rotation, using `x = this->width - y;` would lead to x of range from `this->width` (when `y=0`) to `1` (when `y=this->width-1`). Thus additional -1 is required to get correct coordinates after rotation and prevent image from clipping.
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Samuli Asmala 2019-07-20 11:47:25 +03:00 • committed by GitHub
commit 5ff379c470
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 4 deletions
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8
Arduino UNO/epd2in9/epd2in9/epdpaint.cpp
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@ -118,15 +118,15 @@ void Paint::DrawPixel(int x, int y, int colored) {
return;
}
point_temp = x;
x = this->width - y;
x = this->width - y - 1;
y = point_temp;
DrawAbsolutePixel(x, y, colored);
} else if (this->rotate == ROTATE_180) {
if(x < 0 || x >= this->width || y < 0 || y >= this->height) {
return;
}
x = this->width - x;
y = this->height - y;
x = this->width - x - 1;
y = this->height - y - 1;
DrawAbsolutePixel(x, y, colored);
} else if (this->rotate == ROTATE_270) {
if(x < 0 || x >= this->height || y < 0 || y >= this->width) {
@ -134,7 +134,7 @@ void Paint::DrawPixel(int x, int y, int colored) {
}
point_temp = x;
x = y;
y = this->height - point_temp;
y = this->height - point_temp - 1;
DrawAbsolutePixel(x, y, colored);
}
}