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Mouse coordinates are floating point

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You can get sub-pixel mouse coordinates and motion depending on the platform and display scaling.

Fixes https://github.com/libsdl-org/SDL/issues/2999
This commit is contained in:
Sam Lantinga
2022-12-29 19:31:12 -08:00
parent 8c3239dee5
commit cefbeb582f
52 changed files with 564 additions and 654 deletions
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23
test/testmouse.c
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@@ -33,7 +33,7 @@ typedef struct _Object
{
struct _Object *next;
int x1, y1, x2, y2;
float x1, y1, x2, y2;
Uint8 r, g, b;
SDL_bool isRect;
@@ -56,7 +56,7 @@ void DrawObject(SDL_Renderer *renderer, Object *object)
SDL_SetRenderDrawColor(renderer, object->r, object->g, object->b, 255);
if (object->isRect) {
SDL_Rect rect;
SDL_FRect rect;
if (object->x1 > object->x2) {
rect.x = object->x2;
@@ -74,10 +74,9 @@ void DrawObject(SDL_Renderer *renderer, Object *object)
rect.h = object->y2 - object->y1;
}
/* SDL_RenderRect(renderer, &rect); */
SDL_RenderFillRect(renderer, &rect);
SDL_RenderFillRectFloat(renderer, &rect);
} else {
SDL_RenderLine(renderer, object->x1, object->y1, object->x2, object->y2);
SDL_RenderLineFloat(renderer, object->x1, object->y1, object->x2, object->y2);
}
}
@@ -113,20 +112,18 @@ void loop(void *arg)
switch (event.type) {
case SDL_MOUSEWHEEL:
if (event.wheel.direction == SDL_MOUSEWHEEL_FLIPPED) {
event.wheel.preciseX *= -1.0f;
event.wheel.preciseY *= -1.0f;
event.wheel.x *= -1;
event.wheel.y *= -1;
}
if (event.wheel.preciseX != 0.0f) {
if (event.wheel.x != 0.0f) {
wheel_x_active = SDL_TRUE;
/* "positive to the right and negative to the left" */
wheel_x += event.wheel.preciseX * 10.0f;
wheel_x += event.wheel.x * 10.0f;
}
if (event.wheel.preciseY != 0.0f) {
if (event.wheel.x != 0.0f) {
wheel_y_active = SDL_TRUE;
/* "positive away from the user and negative towards the user" */
wheel_y -= event.wheel.preciseY * 10.0f;
wheel_y -= event.wheel.x * 10.0f;
}
break;
@@ -229,10 +226,10 @@ void loop(void *arg)
/* Mouse wheel */
SDL_SetRenderDrawColor(renderer, 0, 255, 128, 255);
if (wheel_x_active) {
SDL_RenderLine(renderer, (int)wheel_x, 0, (int)wheel_x, SCREEN_HEIGHT);
SDL_RenderLineFloat(renderer, wheel_x, 0.0f, wheel_x, (float)SCREEN_HEIGHT);
}
if (wheel_y_active) {
SDL_RenderLine(renderer, 0, (int)wheel_y, SCREEN_WIDTH, (int)wheel_y);
SDL_RenderLineFloat(renderer, 0.0f, wheel_y, (float)SCREEN_WIDTH, wheel_y);
}
/* Objects from mouse clicks */